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package weed_server
import (
"context"
"fmt"
"net/http"
"net/http/httputil"
"net/url"
"os"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/chrislusf/raft"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
"github.com/chrislusf/seaweedfs/weed/security"
"github.com/chrislusf/seaweedfs/weed/sequence"
"github.com/chrislusf/seaweedfs/weed/shell"
"github.com/chrislusf/seaweedfs/weed/topology"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/chrislusf/seaweedfs/weed/wdclient"
"github.com/gorilla/mux"
"github.com/spf13/viper"
"google.golang.org/grpc"
)
const (
SequencerType = "master.sequencer.type"
SequencerEtcdUrls = "master.sequencer.sequencer_etcd_urls"
)
type MasterOption struct {
Port int
MetaFolder string
VolumeSizeLimitMB uint
VolumePreallocate bool
PulseSeconds int
DefaultReplicaPlacement string
GarbageThreshold float64
WhiteList []string
DisableHttp bool
MetricsAddress string
MetricsIntervalSec int
}
type MasterServer struct {
option *MasterOption
guard *security.Guard
preallocateSize int64
Topo *topology.Topology
vg *topology.VolumeGrowth
vgLock sync.Mutex
bounedLeaderChan chan int
// notifying clients
clientChansLock sync.RWMutex
clientChans map[string]chan *master_pb.VolumeLocation
grpcDialOption grpc.DialOption
MasterClient *wdclient.MasterClient
}
func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *MasterServer {
v := viper.GetViper()
signingKey := v.GetString("jwt.signing.key")
v.SetDefault("jwt.signing.expires_after_seconds", 10)
expiresAfterSec := v.GetInt("jwt.signing.expires_after_seconds")
readSigningKey := v.GetString("jwt.signing.read.key")
v.SetDefault("jwt.signing.read.expires_after_seconds", 60)
readExpiresAfterSec := v.GetInt("jwt.signing.read.expires_after_seconds")
var preallocateSize int64
if option.VolumePreallocate {
preallocateSize = int64(option.VolumeSizeLimitMB) * (1 << 20)
}
grpcDialOption := security.LoadClientTLS(v.Sub("grpc"), "master")
ms := &MasterServer{
option: option,
preallocateSize: preallocateSize,
clientChans: make(map[string]chan *master_pb.VolumeLocation),
grpcDialOption: grpcDialOption,
MasterClient: wdclient.NewMasterClient(context.Background(), grpcDialOption, "master", peers),
}
ms.bounedLeaderChan = make(chan int, 16)
seq := ms.createSequencer(option)
if nil == seq {
glog.Fatalf("create sequencer failed.")
}
ms.Topo = topology.NewTopology("topo", seq, uint64(ms.option.VolumeSizeLimitMB)*1024*1024, ms.option.PulseSeconds)
ms.vg = topology.NewDefaultVolumeGrowth()
glog.V(0).Infoln("Volume Size Limit is", ms.option.VolumeSizeLimitMB, "MB")
ms.guard = security.NewGuard(ms.option.WhiteList, signingKey, expiresAfterSec, readSigningKey, readExpiresAfterSec)
if !ms.option.DisableHttp {
handleStaticResources2(r)
r.HandleFunc("/", ms.proxyToLeader(ms.uiStatusHandler))
r.HandleFunc("/ui/index.html", ms.uiStatusHandler)
r.HandleFunc("/dir/assign", ms.proxyToLeader(ms.guard.WhiteList(ms.dirAssignHandler)))
r.HandleFunc("/dir/lookup", ms.guard.WhiteList(ms.dirLookupHandler))
r.HandleFunc("/dir/status", ms.proxyToLeader(ms.guard.WhiteList(ms.dirStatusHandler)))
r.HandleFunc("/col/delete", ms.proxyToLeader(ms.guard.WhiteList(ms.collectionDeleteHandler)))
r.HandleFunc("/vol/grow", ms.proxyToLeader(ms.guard.WhiteList(ms.volumeGrowHandler)))
r.HandleFunc("/vol/status", ms.proxyToLeader(ms.guard.WhiteList(ms.volumeStatusHandler)))
r.HandleFunc("/vol/vacuum", ms.proxyToLeader(ms.guard.WhiteList(ms.volumeVacuumHandler)))
r.HandleFunc("/submit", ms.guard.WhiteList(ms.submitFromMasterServerHandler))
r.HandleFunc("/stats/health", ms.guard.WhiteList(statsHealthHandler))
r.HandleFunc("/stats/counter", ms.guard.WhiteList(statsCounterHandler))
r.HandleFunc("/stats/memory", ms.guard.WhiteList(statsMemoryHandler))
r.HandleFunc("/{fileId}", ms.redirectHandler)
}
ms.Topo.StartRefreshWritableVolumes(ms.grpcDialOption, ms.option.GarbageThreshold, ms.preallocateSize)
ms.startAdminScripts()
return ms
}
func (ms *MasterServer) SetRaftServer(raftServer *RaftServer) {
ms.Topo.RaftServer = raftServer.raftServer
ms.Topo.RaftServer.AddEventListener(raft.LeaderChangeEventType, func(e raft.Event) {
glog.V(0).Infof("event: %+v", e)
if ms.Topo.RaftServer.Leader() != "" {
glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "becomes leader.")
}
})
ms.Topo.RaftServer.AddEventListener(raft.StateChangeEventType, func(e raft.Event) {
glog.V(0).Infof("state change: %+v", e)
})
if ms.Topo.IsLeader() {
glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", "I am the leader!")
} else {
if ms.Topo.RaftServer.Leader() != "" {
glog.V(0).Infoln("[", ms.Topo.RaftServer.Name(), "]", ms.Topo.RaftServer.Leader(), "is the leader.")
}
}
}
func (ms *MasterServer) proxyToLeader(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
if ms.Topo.IsLeader() {
f(w, r)
} else if ms.Topo.RaftServer != nil && ms.Topo.RaftServer.Leader() != "" {
ms.bounedLeaderChan <- 1
defer func() { <-ms.bounedLeaderChan }()
targetUrl, err := url.Parse("http://" + ms.Topo.RaftServer.Leader())
if err != nil {
writeJsonError(w, r, http.StatusInternalServerError,
fmt.Errorf("Leader URL http://%s Parse Error: %v", ms.Topo.RaftServer.Leader(), err))
return
}
glog.V(4).Infoln("proxying to leader", ms.Topo.RaftServer.Leader())
proxy := httputil.NewSingleHostReverseProxy(targetUrl)
director := proxy.Director
proxy.Director = func(req *http.Request) {
actualHost, err := security.GetActualRemoteHost(req)
if err == nil {
req.Header.Set("HTTP_X_FORWARDED_FOR", actualHost)
}
director(req)
}
proxy.Transport = util.Transport
proxy.ServeHTTP(w, r)
} else {
// drop it to the floor
// writeJsonError(w, r, errors.New(ms.Topo.RaftServer.Name()+" does not know Leader yet:"+ms.Topo.RaftServer.Leader()))
}
}
}
func (ms *MasterServer) startAdminScripts() {
var err error
v := viper.GetViper()
adminScripts := v.GetString("master.maintenance.scripts")
glog.V(0).Infof("adminScripts:\n%v", adminScripts)
if adminScripts == "" {
return
}
v.SetDefault("master.maintenance.sleep_minutes", 17)
sleepMinutes := v.GetInt("master.maintenance.sleep_minutes")
v.SetDefault("master.filer.default_filer_url", "http://localhost:8888/")
filerURL := v.GetString("master.filer.default_filer_url")
scriptLines := strings.Split(adminScripts, "\n")
masterAddress := "localhost:" + strconv.Itoa(ms.option.Port)
var shellOptions shell.ShellOptions
shellOptions.GrpcDialOption = security.LoadClientTLS(viper.Sub("grpc"), "master")
shellOptions.Masters = &masterAddress
shellOptions.FilerHost, shellOptions.FilerPort, shellOptions.Directory, err = util.ParseFilerUrl(filerURL)
if err != nil {
glog.V(0).Infof("failed to parse master.filer.default_filer_urll=%s : %v\n", filerURL, err)
return
}
commandEnv := shell.NewCommandEnv(shellOptions)
reg, _ := regexp.Compile(`'.*?'|".*?"|\S+`)
go commandEnv.MasterClient.KeepConnectedToMaster()
go func() {
commandEnv.MasterClient.WaitUntilConnected()
c := time.Tick(time.Duration(sleepMinutes) * time.Minute)
for _ = range c {
if ms.Topo.IsLeader() {
for _, line := range scriptLines {
cmds := reg.FindAllString(line, -1)
if len(cmds) == 0 {
continue
}
args := make([]string, len(cmds[1:]))
for i := range args {
args[i] = strings.Trim(string(cmds[1+i]), "\"'")
}
cmd := strings.ToLower(cmds[0])
for _, c := range shell.Commands {
if c.Name() == cmd {
glog.V(0).Infof("executing: %s %v", cmd, args)
if err := c.Do(args, commandEnv, os.Stdout); err != nil {
glog.V(0).Infof("error: %v", err)
}
}
}
}
}
}
}()
}
func (ms *MasterServer) createSequencer(option *MasterOption) sequence.Sequencer {
var seq sequence.Sequencer
v := viper.GetViper()
seqType := strings.ToLower(v.GetString(SequencerType))
glog.V(1).Infof("[%s] : [%s]", SequencerType, seqType)
switch strings.ToLower(seqType) {
case "etcd":
var err error
urls := v.GetString(SequencerEtcdUrls)
glog.V(0).Infof("[%s] : [%s]", SequencerEtcdUrls, urls)
seq, err = sequence.NewEtcdSequencer(urls, option.MetaFolder)
if err != nil {
glog.Error(err)
seq = nil
}
default:
seq = sequence.NewMemorySequencer()
}
return seq
}
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